The 2nd seed duo will play against South Korea's Jung Jae Sung/Lee Yong Dae for a final spot. Jung and Lee overcame China's World Champions Cai Yun/Fu Haifeng for the fourth time in a month, 21-19, 21-16.

"They have improved a lot in the past couple of years," said Cai. "Comparing with the other top pairs in the world, they don't have a particular shortcoming and they are also the youngest. I would say they have been the biggest threat to us toward the London Olympics."

Another South Korean pair Ko Sung Hyun/Yoo Yeon Seong will compete with Howard Bach/Tony Gunawan in the semifinals.

In the women's singles, the third seed Wang Shixian from China, newly crowned at the Guangzhou Asian Games, beat Thai teenager Inthanon Ratchanok in straight sets. The 15-year-old rising star managed to lead into the interval of the second set but failed to keep pushing her elite opponent.

"I am not strong enough to win such a tournament yet," said Ratchanok. "It is more important for me to get experiences."

Top seed Wang Xin ousted veteran Pi Hongyan from France in two sets to set up a third clash with compatriot Wang Shixian in three weeks after the Asian Games and China Open. Wang Xin, 25, lost to her younger teammate Wang Shixian, 20, twice both by 2-0 in the Asiad final and China Open semifinals.

Another Chinese woman Jiang Yanjiao, however, was knocked out by Germany's Juliane Schenk 21-14, 16-21, 21-12 in over an hour. Jiang, winning the China Open for the third consecutive time only five days earlier, said she has been short of energy coming to Hong Kong.

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